Bubble machine



FIG. 1 is a top perspective view of a bubble machine showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom perspective view thereof; and,

FIG. 9 is an enlarged view of the selected portion in FIG. 1 .

The broken lines shown in the drawings depict portions of the bubble machine in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a bubble machine, as shown and described. 